<template>
    <div>
         <!-- 面包屑导航区域 -->
         <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
         <!-- 卡片视图区域 -->
         <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意: 只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
            <!-- 选择商品分类区域 -->
            <el-row>
                <el-col class="cat_opt">
                    <span>选择商品分类: </span>
                    <!-- 选择商品分类的级联选择框 -->
              <el-cascader expand-trigger="hover" v-model="selectedCateKeys" :options="catalist" :props="cateProps" @change="handleChanged" clearable change-on-select></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
              <!-- 添加动态参数面板 -->
              <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                 <el-table :data="manyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                    <template slot-scope="scope">
                      <!-- 循环渲染Tag标签 -->
                      <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hangleClose(i,scope.row)">{{ item }}</el-tag>
                      <!-- 添加按钮 -->
                      <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                      size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>
                  <!-- 索引列 -->
                   <el-table-column type="index" label="#"></el-table-column>
                   <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                   <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                   </el-table-column>
                 </el-table>
              </el-tab-pane>
              <!-- 添加静态属性的面板 -->
              <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性的按钮 -->
                 <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                 <!-- 静态参数表格 -->
                 <el-table :data="onlyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                    <template slot-scope="scope">
                      <!-- 循环渲染Tag标签 -->
                      <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hangleClose(i,scope.row)">{{ item }}</el-tag>
                      <!-- 添加按钮 -->
                      <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                      size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>
                  <!-- 索引列 -->
                   <el-table-column type="index" label="#"></el-table-column>
                   <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                   <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                   </el-table-column>
                 </el-table>
              </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogVisibleClose">
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogVisibleClose">
          <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
  data () {
    return {
      // 商品分类列表
      catalist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: 'true', message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: 'true', message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) { return this.$message.error('获取商品分类失败!') }
      this.catalist = res.data
      console.log(this.catalist)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChanged () {
    //   console.log(this.selectedCateKeys)
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的Id，和当前所处 的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) { return this.$message.error('获取参数列表失败！') }
      // forEach循环
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogVisibleClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 重置修改的表单
    editDialogVisibleClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) { return this.$message.error('添加参数失败!') }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改对话框
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) { return this.$message.error('获取参数信息失败！') }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击按钮，修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本失去焦点，或按下 Enter 都会触发
    async handleInputConfirm (row) {
      // trim 去除字符串两端的空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrVals (row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(',') })
      if (res.meta.status !== 200) { return this.$message.error('修改参数项失败！') }
      return this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    hangleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true ，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 选中的是三级分类的Id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style scoped lang="less">
.cat_opt {
    margin: 15px 0;
}
.el-tag {
  margin: 20px;
}
.el-input {
  width: 120px;
}
</style>
